Improvement in machines for straightening bolts



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l. i l i C 1 Letters Patent No. 111,941, dated February 21, 41871.

IMPROVSMNT IN MACHINES FOR STRAIGHTENING BOLTS.

To all rwhom 'it Imay concern:

Be it known that I, CHARLES E. HUNTER., oi' Hinsdale,A in the county o f Cheshire and State ot' New Hampshire, have invented a new and improved Bolt- Straightening Apparatus, and Ido' hereby declare that the following is a full, cleai 'and exact description thereof,l which will erable others skilled in the art to make and use thesame, reference being had to the accompanying drawing forming part ot' this specification.

This invention relates tc impre ratus for straightening bolt-e;` ai

It consists in a combination a' a shank-holding at.- tachment and clamping and holding devices therefor with a metal block or seva called, preferably of iron, having' grooves of diierent sizes in or across the face, eorrespomling in fo a and sine to the heads of the bolts to be istraighte'ied, with which the said shank-holdin g attachment 1 so arranged that the shank of the boltniay heini. in it and the head in the groove in the block, nppcrted that the bolt may be readily straiffl l t the juncture of the shank with 1el land shank brought int', tl l y a hainmer delivered on the shank. ci al` Figure l a side elevation et" the apparatus, with the clamping apparatus sectioned, and

Figure 2 is a vertical seeticn.

Similar letters of reference indicate eorrespomling parts. r

A is the metal yblock or isoiv, having one or more grooves, B,"in its upper face, Icorrespoinling inshape and size to the heads of the bolts to be straightened. It is provided with the transverse grooves G in the vertical end walls, t'or the connecting-bolts D oi' the bars E, one ot' which is clamped against each of the sides, between which the grooies B run.

l"1 is the shanlcholding att vements in appaent, consisting of a iiat piece ot' steel ol" suitab E l -and dimensions,

having a groove in the nppej: endsatcd for the shank of the bolt to lie in. it isprlaeed against the side of r, i i

i t .a n Ver@ ya n the block, with its groove coinciding axially'with the groove B of the block A, in which the bolt to be trued is to be placed and supported above one ofthe bars E byan adj usting-liey, H, resting on said bar; and it is firmly clamped against the said side by the clampingbars I and bolts K, as clearly shown.

The bolt L to be trued is laid on the groove B, and the shank in the groove G, with the high or concave side up, and struck with a hammer till brought to the right line.

rlhc block A may have any suitable number of these grooves in each end of different sizes and shapes, and a shank-holding plate, F, may be provided `for each groove B, with a groove corresponding to the size ot' the shank of the bolt for which the groove B is intended.

'lhc bars E may be supported at different distances from the ends oi' the block A, according to the required lengths ol" the plates F. The adjusting-key need not be necessarily used, i the hars E are placed at the right height and the plates 11 made iu suitable lengths.

lhe attachment may be applied'to the anvil of anyA trip-hannner or drop, and used for straightening tools or other articles, the grooves on the plate F and anvil being suited in shape and size to the said tool or other articles to be treated; and I propose 'to make such application of it.

Having thus described my invention,

I claim as new and desire to secure by Letters Patent- 1.."l`he combination, with the block or sow A, having the grooves B and C, of the shank-holding plate F, bars E I, and their clamping-bolts, all substantially as speciiied. 2. The combination, with the above, ofthe adjusting-key H, substantially as specified.

CHARLES E. HUNTER. Witnesses:

HENRY E. HUNTER, WARREN S. BARRoWs. 

